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+ create AUTHORS file
+ fix the linking exception in LICENSE
+ update the "About" in IDE
+ remove the trailing whitespace
+ inflate my scores at Ohloh

Thanks to Johannes Kanig for this useful suggestion.

- the new syntax for localisation "labels" in Why is as follows:

    goal Toto #"file" line bchar echar#     - after an ident
    #"file" line bchar echar" (A and B)     - before a term/fmla

- the new syntax for buffer relocation is as follows:

    ##"file" line char##

in order to cope with a "two view" syndrom in util.ml/.mli

Perhaps another solution exists

This reverts commit 9809329892bb9637a0137d330ecd08a16ede2d93.

The relevant hash-tables are weak both in keys and values

- copy the code of Pretty to Why3 to prepare it for Driver
- move goal_of_ctxt to Transform, where it belongs 
- comment out the unused "extract_goals" in Transform
- comment out the debugging printing in Theory, use Pretty
- in use_export, put the Duse declaration after the copied
  declarations, not before

- prevent leak of idents by separating them into two types:
  - "preid" -- user-created and non-unique
  - "ident" -- unique, generated from "preid" by various
               smart constructors: create_tysymbol, etc

  This guarantees that two different symbols never share
  an ident.

- no need to hashcons tysymbols, fsymbols, and psymbols,
  as they are unique by construction

- make separate hashconsing smart constructors for decl

- export namespace as a private record (no reason to not to)

- some code rearrangement in hashconsing of decls

- fix namespace merging in close_namespace

- namespace name can be just a string, no need to use ident

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